This RAIN4 screen has a giant growth ring which protects the center section from light-blocking and flow-blocking that often happens otherwise (see http://algaescrubber.net/forums/show...3-Growth-Rings )
This RAIN4 screen has a giant growth ring which protects the center section from light-blocking and flow-blocking that often happens otherwise (see http://algaescrubber.net/forums/show...3-Growth-Rings )
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